Is a mass driver/railgun/coilgun legally considered a gun?

[Slackhaus]

No “Destructive Devices” require a propellant.

[Czarcasm]

@Slackhaus

You need a class II license to sell a firearm you made. There are no licensing requirements on home made guns (they don’t even need a serial number) .

A non-licensed person may make a firearm, provided it is not for sale and the maker is not otherwise prohibited from possessing firearms (such as a convicted felon). (18 U.S.C., Chapter 44; § 922 (d).) Federal law imposes none of the same restrictions on non-licensed possessors, and as a result, homemade guns need not be registered and the owner need not undergo a background check.

This thread has been bumped several times since that was said 9 years ago.